Lecture Scaling Networks - Chapter 8: EIGRP Advanced Configurations and Troubleshooting

Configure a router to propagate a default route in an EIGRP network, modify EIGRP interface settings to improve network performance, configure EIGRP authentication to ensure secure routing updates, explain the process and tools used to troubleshoot an EIGRP network, troubleshoot neighbor adjacency issues in an EIGRP network, troubleshoot missing route entries in an EIGRP routing table.
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Lecture Scaling Networks - Chapter 8: EIGRP Advanced Configurations and Troubleshooting Chapter 8: EIGRP Advanced Configurations and Troubleshooting Scaling Networks Presentation_ID © 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential 1 Chapter 8 8.1 Advanced EIGRP Configurations 8.2 Troubleshooting EIGRP 8.3 Summary Presentation_ID © 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential 2 Chapter 8: Objectives After completing this chapter, you will be able to:  Configure EIGRP automatic summarization.  Configure EIGRP manual summarization.  Configure a router to propagate a default route in an EIGRP network.  Modify EIGRP interface settings to improve network performance.  Configure EIGRP authentication to ensure secure routing updates.  Explain the process and tools used to troubleshoot an EIGRP network.  Troubleshoot neighbor adjacency issues in an EIGRP network.  Troubleshoot missing route entries in an EIGRP routing table. Presentation_ID © 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential 3 Automatic Summarization Network Technology Presentation_ID © 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential 4 Automatic Summarization EIGRP Automatic Summarization Presentation_ID © 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential 5 Automatic Summarization Configuring EIGRP Automatic Summarization  EIGRP for IPv4 automatic summarization is disabled, by default, beginning with Cisco IOS Release 15.0(1)M and 12.2(33). Prior to this, automatic summarization was enabled, by default.  To enable automatic summarization for EIGRP, use the auto- summary command in router configuration mode. R1(config)# router eigrp autonomous-system R1(config-router)# auto-summary  Use the no form of this command to disable autosummarization. R1(config)# router eigrp autonomous-system R1(config-router)# no auto-summary Presentation_ID © 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential 6 Autosummarization Verifying Autosummarization: show ip protocols Presentation_ID © 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential 7 Autosummarization Verifying Autosummarization: Topology Table Presentation_ID © 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential 8 Autosummarization Verifying Autosummarization: Routing Table Presentation_ID © 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential 9 Autosummarization Summary Route Presentation_ID © 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential 10 Autosummarization Summary Route (cont.) Presentation_ID © 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential 11 Manual Summarization Manual Summary Routes  EIGRP can be configured to summarize routes, whether or not autosummarization is enabled.  Because EIGRP is a classless routing protocol and includes the subnet mask in the routing updates, manual summarization can include supernet routes.  A supernet is an aggregation of multiple major classful network addresses. Presentation_ID © 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential 12 Manual Summarization Configuring EIGRP Manual Summary Routes Presentation_ID © 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential 13 Manual Summarization Verifying Manual Summary Routes Presentation_ID © 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential 14 Manual Summarization EIGRP for IPv6: Manual Summary Routes Presentation_ID © 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential 15 Default Route Propagation Propagating a Default Static Route  Using a static route to 0.0.0.0/0 as a default route is not routing protocol-dependent.  The quad zero static default route can be used with any currently supported routing protocols.  The static default route is usually configured on the router that has a connection to a network outside the EIGRP routing domain, for example, to an ISP. Presentation_ID © 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential 16 Default Route Propagation Verifying the Propagated Default Route The entry for the EIGRP-learned default route is identified by the following:  D – This route was learned from an EIGRP routing update.  * – The route is a candidate for a default route.  EX – The route is an external EIGRP route; in this case, a static route outside of the EIGRP routing domain.  170 – This is the administrative distance of an external EIGRP route. Presentation_ID © 2008 Cisco Systems, Inc. All rights reserved. Cisco Confidential 17 Default Route Propagation EIGRP for IPv6- Default Route Note: Some IOSs may require that the redistribute static command include the EIGRP metric parameters and maximum transmission unit (MTU) before the static route can be redistributed. These parameters may vary, but an example for this scenario would be: R2(config)# ipv6 router eigrp 2 ...